Golang : Validate email address with regular expression

This short tutorial is add on to my previous tutorial on how to validate email address with Golang. This time, the validation is done with regular expression instead of invoking external function.

There are couple of regular expressions that can be used to validate an email address. For this tutorial, we will use this

^[a-z0-9._%+\-]+@[a-z0-9.\-]+\.[a-z]{2,4}$ regular expression to validate the email address.

 package main

 import (
  "fmt"
  "regexp"
 )

 func validateEmail(email string) bool {
  Re := regexp.MustCompile(`^[a-z0-9._%+\-]+@[a-z0-9.\-]+\.[a-z]{2,4}$`)
  return Re.MatchString(email)
 }

 func main() {

  email := "abc@abc12"

  if !validateEmail(email) {
 fmt.Println("Email address is invalid")
  } else {
 fmt.Println("Email address is VALID")
  }

  email = "[email protected]"

  if !validateEmail(email) {
 fmt.Println("Email address is invalid")
  } else {
 fmt.Println("Email address is VALID")
  }
 }

Sample output :

Email address is invalid

Email address is VALID

Note :

Some people, when confronted with a problem, think, “I know, I’ll use regular expressions.” Now they have two problems. — Jamie Zawinksi

Reference :

https://groups.google.com/forum/#!topic/golang-nuts/UAq5fio6xBQ